Molten metal pump

Abstract

A molten metal pump includes a base member, an impeller housed within a base chamber of the base member such that rotation of the impeller draws molten metal into the base chamber at an inlet and forces molten metal through an outlet of the base chamber, an elongated shaft connected at a first end to the impeller and at a second end extending into a motor mount chamber and coupled to a motor. A heat exchanger may be included to actively cool the motor mount chamber (e.g., a lower portion thereof). A tube extending from outside the motor mount chamber to within the motor mount chamber may be included to provide back pressure to a seal between a lower inlet of the motor mount chamber and a portion of the elongated shaft extending therethrough.

Description

Atty. Dkt. No. MLCZ 200281W01MOLTEN METAL PUMPBACKGROUND

[0001] The present exemplary embodiment relates to a motor mount assembly and a molten metal pump including the motor mount assembly. This application claims the benefit of US Provisional Application 63 / 683,053 filed August 14, 2025, the disclosure of which is herein incorporated by reference.

[0002] In the course of processing molten materials, it is often necessary to transfer the molten materials from one vessel to another or to circulate the molten materials within a vessel. Pumps for processing molten materials are commonly used for these purposes. Molten metal pumps have been described in U.S. Pat. Nos. 5,947,705; 6,354,796; 6,254,340; 6,451 ,247; 6,464,458; 9,951 ,777; 11 ,131 ,309; 11 ,136,984; and 11 ,193,492; and U.S. Patent Publication No. US2022 / 0403846, each of which is herein incorporated by reference in its entirety except for any inconsistent definitions, disclaimers, or disavowals with the present application. The pumps can also be used for other purposes, such as to inject purifying gases into the molten materials being pumped.

[0003] Molten metal pumps are utilized to transfer or recirculate molten metal through a system of pipes or within a storage vessel. These pumps generally include a motor supported by a base member having a rotatable elongated shaft extending into a body of molten metal to rotate an impeller. The base member is submerged in the molten metal and includes a housing or pump chamber having the impeller located therein. The motor is supported by a platform that is rigidly attached to a plurality of structural posts or a central support tube that is attached to the base member. The plurality of structural posts and the rotatable elongated shaft extends from the motor and into the pump chamber submerged in the molten metal within which the impeller is rotated. Rotation of the impeller therein causes a directed flow of molten metal.

[0004] The impeller is mounted within the base chamber in the base member and is supported by bearing rings to act as a wear resistant surface and allow smooth rotation therein. Additionally, a radial bearing surface can be provided on the elongated shaft or impeller to prevent excessive vibration of the pump assembly which could lead to inefficiency or even failure of pump components. These pumps have traditionally been referred to as centrifugal pumps.

[0005] There are issues associated with heat from the molten metal negatively impacting the motor and difficulties with maintaining a seal to isolate the molten metal chamber.

[0006] It would be desirable to develop new molten metal pumps which more effectively separate the motor from the molten metal and associated hot gas.BRIEF DESCRIPTION

[0007] Disclosed, in some embodiments, is molten metal pump including: a base member having a base chamber including a molten metal inlet and a molten metal outlet; an impeller housed within the base chamber such that rotation of the impeller draws molten metal into the molten metal inlet and forces molten metal through the molten metal outlet; a motor mount chamber comprising a lower inlet; a motor mounted on the motor mount chamber; an elongated shaft connected at a first end to the impeller and at a second end to the motor, wherein the elongated shaft extends through the lower inlet of the motor mount chamber and the second end is located within the motor mount chamber; and a cover gas injector a cover gas inlet and a cover gas outlet, the cover gas outlet being located inside the motor mount chamber to provide back pressure to a seal between the lower inlet and a portion of the elongated shaft extending therethrough when a gas is provided through the cover gas inlet.

[0008] In some embodiments, the cover gas outlet is directed towards a coupling between the motor and the elongated shaft.

[0009] The molten metal pump may further include a first pressure sensor configured to measure a first pressure within the motor mount chamber.

[0010] In some embodiments, the molten metal pump includes a pressure relief valve for venting the motor mount chamber.

[0011] The molten metal pump may further include a temperature sensor configured to measure a temperature within the motor mount chamber.

[0012] In some embodiments, the molten metal pump includes: a controller; a first pressure sensor configured to measure a first pressure within the motor mount chamber; and a pressure relief valve for venting the motor mount chamber. The controller may be configured to control the pressure relief valve and / or a flow rate through the cover gasinlet to maintain a differential between the first pressure and a second pressure in a headspace above a molten metal level and below the seal within a predetermined range.

[0013] The motor mount chamber may include an access cover defining a sidewall thereof.

[0014] In some embodiments, the motor mount chamber includes a top plate comprising a motor opening for receiving a portion of the motor and a cover gas inlet opening for receiving the cover gas injector.

[0015] Disclosed, in other embodiments, is a molten metal pump including: a base member having a base chamber including a molten metal inlet and a molten metal outlet; an impeller housed within the base chamber such that rotation of the impeller draws molten metal into the molten metal inlet and forces molten metal through the molten metal outlet; a motor mount chamber comprising a lower inlet; a motor mounted on the motor mount chamber; an elongated shaft connected at a first end to the impeller and at a second end to motor, wherein the second end is located within the motor mount chamber; and a first heat exchanger. The first heat exchanger includes a first inlet; a first outlet; and a first heat exchange surface within the motor mount chamber configured to actively cool the motor mount chamber when coolant is provided to the first inlet.

[0016] The heat exchanger may include a radiator.

[0017] In some embodiments, the molten metal pump further includes a temperature sensor configured to measure a temperature within the motor mount chamber.

[0018] The molten metal pump may further include a controller configured to adjust a flow rate of coolant fluid through the first heat exchanger based on the temperature measured by the temperature sensor.

[0019] In some embodiments, the temperature sensor includes a thermocouple.

[0020] The molten metal pump may further include a second heat exchanger having: a second inlet; a second outlet; and a second heat exchange surface within the motor mount chamber configured to actively cool the motor mount chamber when coolant is provided to the second inlet.

[0021] In some embodiments, the first heat exchange surface and the second heat exchange surface are secured to a bottom of the motor mount chamber.

[0022] The motor mount chamber may include an access cover defining a sidewall thereof.

[0023] In some embodiments, the motor mount chamber includes a top plate having a motor opening for receiving a portion of the motor and a coolant opening for receiving the first heat exchanger.

[0024] The molten metal pump may further include insulation beneath a bottom plate of the motor mount chamber.

[0025] Disclosed, in further embodiments, is a molten metal pump including: a base member having a base chamber including a molten metal inlet and a molten metal outlet; an impeller housed within the base chamber such that rotation of the impeller draws molten metal into the molten metal inlet and forces molten metal through the molten metal outlet; a motor mount chamber having a lower inlet; a motor mounted on the motor mount chamber; an elongated shaft connected at a first end to the impeller and at a second end to the motor, wherein the elongated shaft extends through the lower inlet of the motor mount chamber and the second end is located within the motor mount chamber; a cover gas injector extending from outside the motor mount chamber to within the motor mount chamber to provide back pressure to a seal between the lower inlet and a portion of the elongated shaft extending therethrough; and a heat exchanger including: an inlet; an outlet; and a heat exchange surface within the motor mount chamber configured to actively cool the motor mount chamber when coolant is provided to the inlet.

[0026] The molten metal pump may further include a control system having: a first pressure sensor configured to measure a first pressure within the motor mount chamber; a pressure relief valve for venting the motor mount chamber; and a temperature sensor configured to measure a temperature within the motor mount chamber.

[0027] The controller may be configured to control the pressure relief valve and / or a flow rate through the gas inlet to maintain a differential between the first pressure and a second pressure in a headspace above a molten metal level and below the seal within a predetermined range. The controller may additionally or alternatively be configured to adjust a flow rate of coolant fluid through the first heat exchanger based on the temperature.BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The following is a brief description of the drawings, which are presented for the purposes of illustrating the exemplary embodiments disclosed herein and not for the purposes of limiting the same.

[0029] FIG. 1 is a perspective view of a molten metal pump in accordance with some embodiments of the present disclosure.

[0030] FIG. 2 is a cross-sectional view of the molten metal pump of FIG. 1 .

[0031] FIG. 3 is a cross-sectional view of a portion of a molten metal pump in accordance with some embodiments of the present disclosure.

[0032] FIG. 4 is a cross-sectional view illustrating different zones of a molten metal pump in accordance with some embodiments of the present disclosure.

[0033] FIG. 5 is a perspective view illustrating a motor mount chamber of a molten metal pump in accordance with some embodiments of the present disclosure and a region above the motor mount chamber.

[0034] FIG. 6 is a perspective view illustrating a region above a motor mount chamber of a molten metal pump in accordance with some embodiments of the present disclosure.

[0035] FIG. 7 is a cross-sectional view of a portion of a molten metal pump assembly in accordance with some embodiments of the present disclosure.

[0036] FIG. 8 is a perspective view illustrating a motor mount chamber of a molten metal pump in accordance with some embodiments of the present disclosure and a region above the motor mount chamber.

[0037] FIG. 9 illustrates temperature profiles as a function of position on pump (i.e., height) for traditional, passively cooled molten metal pumps (top) and actively cooled molten metal pumps in accordance with some embodiments of the present disclosure (bottom).

[0038] FIG. 10 is a perspective view of components associated with a top plate of a molten metal pump in accordance with some embodiments of the present disclosure.

[0039] FIG. 11 is a top view of the top plate of FIG. 10.DETAILED DESCRIPTION

[0040] The present disclosure may be understood more readily by reference to the following detailed description of desired embodiments included therein. In the following specification and the claims which follow, reference will be made to a number of terms which shall be defined to have the following meanings.

[0041] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. In case of conflict, the present document, including definitions, will control. Preferred methods and materials are described below, although methods and materials similar or equivalent can be used in practice or testing of the present disclosure. All publications, patent applications, patents, and other references mentioned herein are incorporated by reference in their entirety. The materials, methods, and articles disclosed herein are illustrative only and not intended to be limiting.

[0042] The singular forms “a,” “an,” and “the” include plural referents unless the context clearly dictates otherwise.

[0043] As used in the specification and in the claims, the term “comprising” may include the embodiments “consisting of” and “consisting essentially of.” The terms “comprise(s),” “include(s),” “having,” “has,” “can,” “contain(s),” and variants thereof, as used herein, are intended to be open-ended transitional phrases that require the presence of the named ingredients / steps and permit the presence of other ingredients / steps. However, such description should be construed as also describing compositions, mixtures, or processes as “consisting of” and “consisting essentially of” the enumerated ingredients / steps, which allows the presence of only the named ingredients / steps, along with any impurities that might result therefrom, and excludes other ingredients / steps.

[0044] The present disclosure relates to molten metal pumps with more effective heat break zones and / or better seals.

[0045] FIGS. 1 and 2 are side perspective and side cross-sectional views of a molten metal pump 20 in accordance with some embodiments of the present disclosure. The molten metal pump includes a motor 1 , an associated blower 3, and a hanger 2 for mounting the molten metal pump 20. The molten metal pump 20 further includes a motor mount chamber 4 including an access cover 5, motor opening, and a shaft opening. Aportion of the motor 1 extends through the motor opening and an upper seal 11 is provided therebetween. The motor 1 is coupled to an elongated shaft 8 at a coupling 12. A portion of the shaft 8 extends through the shaft opening and a lower seal 13 is provided therebetween. The shaft 8 is associated with an impeller 9 of a base member 10 which further includes a base bearing 14, an impeller bearing 15, and an outlet 16. Posts 7 are included to secure the base member 10 and the motor mount 4. Insulation 6 may be included to reduce heat transfer from a molten metal to the motor mount chamber 4.

[0046] In use, the base member 10, shaft 8, and posts 7 will be at least partially submerged in a bath of a molten metal (e.g., aluminum). The bath may be located within a furnace or tank (not shown).

[0047] The motor may be adapted to be run at variable speed by a programmable controller, such as a computer or other processor. The elongated shaft 8 is connected to the impeller 9 located in a chamber of the base member 10. The base member 10 is suspended by a plurality of refractory posts 7 attached to a motor mount 4. An alternative form of post could also be employed wherein a steel rod surrounded by a refractory sheath extends between the motor mount 4 and the base member 10.

[0048] The elongated shaft 8 is rotated by the motor 1 and extends from the motor 1 and into a pump chamber submerged in the molten metal within which the impeller 9 is rotated. Rotation of the impeller 9 therein causes a directed flow of molten metal through an associated metal delivery conduit (not shown) such as a riser, adapted for fluid metal flow and connected to the outlet 16. The outlet is typically adjacent to a side wall (as depicted in FIG. 1 ) or top wall of the base member 10. The pump may be a transfer pump. An example of one suitable transfer pump is shown in U.S. Patent 5,947,705, the disclosure of which is herein incorporated by reference.

[0049] The elongated shaft 8 has a cylindrical shape having a rotational axis that is generally perpendicular to the base member 10. The elongated shaft has a proximal end that is adapted to attach to the motor 1 by the coupling 12 and a distal end that is connected to the impeller 9. The impeller 9 is rotatably positioned within the pump chamber such that operation of the motor 1 rotates the elongated shaft 8 which rotates the impeller 9 within the pump chamber.

[0050] The base member 10 is configured to structurally receive the posts 7 (optionally comprised of an elongated metal rod within a protective refractory sheath) within passages. Each passage may be adapted to receive the metal rod component of the refractory post 7 to rigidly attach to the motor mount 4. The motor mount 4 supports the motor 1 above the molten metal.

[0051] A bored or bird cage impeller may be advantageous because they include a defined radial edge allowing a designed tolerance (or bypass gap) to be created with the pump chamber. An example of a bored impeller is provided by U.S. Patent 6,464,458.

[0052] The rotation of the impeller 9 draws molten metal into an inlet and into the chamber such that continued rotation of the impeller 9 causes molten metal to be forced out of the pump chamber to an outlet 16 of the base member 10.

[0053] A command RPM profile can be programmed into a controller to electrically communicate with the motor to rotate the impeller and force molten metal through the outlet. The controller may be part of a feedback control system or closed-loop control system. These system may include sensors such as probes, or any similar monitoring mechanism capable of monitoring a property associated with operating the pump and sending feedback signals to the controller. In some embodiments, the controller is a proportional-integral-derivative (PID) controller, suitable for feedback control systems. The controller can take the error (i.e., difference) between the desired system output and the measured system output and adjust the command voltage to the motor in order to operate the impeller at a desired rotational speed for maintaining the desired system output.

[0054] It is desirable to form a tight seal between the motor mount chamber and the elongated shaft.

[0055] FIG. 3 is a cross-sectional view of a molten metal pump 120 which includes a tube (e.g., a cover gas injector) 125 for providing gas to the motor mount chamber 104. The gas provided via the tube 125 can increase pressure in the motor mount chamber 104. This may be beneficial because when the pressure in the headspace of the molten metal chamber below greatly exceeds the pressure in the motor mount chamber 104, there is a risk that the lower seal 113 will be blown out. In some embodiments, an outletof the tube 125 is directed towards the coupling 112 between the motor 101 and the elongated shaft 108.

[0056] FIG. 4 illustrates pressure zones in a portion of a molten metal pump assembly 221 in accordance with some embodiments of the present disclosure. In particular, the molten metal chamber defines a hot pressure zone 222 and the motor mount chamber 204 defines a cool pressure zone 223. A rotary seal 213 between the elongated shaft 208 and the motor mount chamber 204 also separates hot pressure zone 222 from the cool pressure zone 223. The container to which the molten metal pump is attached to define the molten metal chamber contains molten metal and thus contains gas at a very high temperature (e.g., 2000 °F and 5 lbs. of pressure). It is advantageous to keep this fluid away from the motor. Gas, which may be of the same material and pressure but low temperature, can be added to the cool pressure zone 223. This gas may provide backpressure on the rotary seal 213, thereby reducing the mechanical stresses it experiences. Regarding the rotary seal 213, seals between moving ceramic parts are fragile. The seal advantageously provides a barrier between the molten metal chamber and the motor mount chamber to limit the convection of hot material.

[0057] FIG. 5 is a perspective view of a motor mount chamber 304 and a portion of the associated components. The interior of the chamber 304 is visible because the associated cover has been removed. In the depicted embodiment, the cover gas injector 325 is configured to provide gas aimed toward the coupling 312. In addition to enhancing the seal, the temperature of the provided gas may be used to regulate (e.g., reduce) the temperature in the motor mount chamber 304.

[0058] FIG. 6 is a perspective view of a portion of a molten metal pump 420 including a heat exchanger (e.g., radiator) 429 through which compressed air can be applied to improve temperature isolation of the motor 401 .

[0059] It is also desirable to create a heat break zone across the motor mount and coupling. Some known molten metal pumps utilize insulation and / or coupling geometry to achieve this effect.

[0060] FIGS. 7 and 8 are side cross-sectional and partial perspective views of a molten metal pump 520 which is configured for active cooling in the motor mount chamber 504 using a heat exchanger (e.g., a radiator) 530. In the depicted embodiment, there are twoheat exchangers 530, each including an inlet 531 , a heat exchange surface 532, and an outlet 533. The heat exchange surfaces 532 may be advantageously provided to a bottom surface of the motor mount chamber 504 in order to achieve a desired temperature profile as illustrated in FIG. 9. In the depicted embodiment, there are two radiators in the pump. They are isolated from the cover gas, ambient air, and each other. Compressed air, or other fluids, can be routed through these coils to increase thermal isolation of the pump. The desired temperature profile may include a temperature decrease at the bottom of the motor mount chamber to reduce heat provided to the coupling and motor.

[0061] FIG. 10 is a top perspective view of a portion of a motor mount chamber 604 in accordance with some embodiments of the present disclosure. Extending through the top plate 640 are heat exchanger inlets 631 and outlets 633, gas inlet 629, cover gas injector 625 inlet, a thermocouple 650, a pressure gauge 660, and a pressure release valve 670.

[0062] The thermocouple 650 may be available to check the internal temperature of the cavity. It is also possible to include multiple pressure sensors to monitor the temperatures at different heights within the motor mount chamber.

[0063] The pressure gauge 660 may give a reading (e.g., 0 to 15 lbs.) within the body of the pump. This may match a cover gas pressure.

[0064] The pressure release valve 670 may vent the cavity if the pressure exceeds a predetermined value (e.g., 15 lbs.).

[0065] FIG. 11 is a top view of the top plate 640 including labeled apertures for various components.

[0066] Pressures measured in the motor mount chamber and the molten metal chamber may be used by a control system to automatically control the pressure release valve and / or cover gas flow rate into the motor mount chamber in order to maintain a pressure difference below a predetermined amount.

[0067] The temperature sensor(s) within the motor mount chamber may be used by a control system to automatically adjust cover gas flow rate, cover gas temperature, coolant fluid flow rate, and / or coolant fluid temperature to maintain a desired temperature profile.

[0068] The exemplary embodiment has been described with reference to the preferred embodiments. Obviously, modifications and alterations will occur to others upon reading and understanding the preceding detailed description. It is intended that the exemplaryembodiment be construed as including all such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.

Claims

CLAIMS:

1. A molten metal pump comprising: a base member comprising a base chamber having a molten metal inlet and a molten metal outlet; an impeller housed within the base chamber such that rotation of the impeller draws molten metal into the molten metal inlet and forces molten metal through the molten metal outlet; a motor mount chamber comprising a lower inlet; a motor mounted on the motor mount chamber; an elongated shaft connected at a first end to the impeller and at a second end to the motor, wherein the elongated shaft extends through the lower inlet of the motor mount chamber and the second end is located within the motor mount chamber; and a cover gas injector comprising a cover gas inlet and a cover gas outlet, the cover gas outlet being located inside the motor mount chamber to provide back pressure to a seal between the lower inlet and a portion of the elongated shaft extending therethrough when a gas is provided through the cover gas inlet.

2. The molten metal pump of claim 1 , wherein the cover gas outlet is directed towards a coupling between the motor and the elongated shaft.

3. The molten metal pump of claim 1 , further comprising: a first pressure sensor configured to measure a first pressure within the motor mount chamber.

4. The molten metal pump of claim 1 , further comprising: a pressure relief valve for venting the motor mount chamber.

5. The molten metal pump of claim 1 , further comprising: a temperature sensor configured to measure a temperature within the motor mount chamber.

6. The molten metal pump of claim 1 , further comprising: a controller; a first pressure sensor configured to measure a first pressure within the motor mount chamber; and a pressure relief valve for venting the motor mount chamber; wherein the controller is configured to control the pressure relief valve and / or a flow rate through the gas inlet to maintain a differential between the first pressure and a second pressure in a headspace above a molten metal level and below the seal within a predetermined range.

7. The molten metal pump of claim 1 , wherein the motor mount chamber comprises an access cover defining a sidewall thereof.

8. The molten metal pump of claim 1 , wherein the motor mount chamber comprises a top plate comprising a motor opening for receiving a portion of the motor and a gas inlet opening for receiving the cover gas injector.

9. A molten metal pump comprising: a base member comprising a base chamber having a molten metal inlet and a molten metal outlet; an impeller housed within the base chamber such that rotation of the impeller draws molten metal into the molten metal inlet and forces molten metal through the molten metal outlet; a motor mount chamber comprising a lower inlet; a motor mounted on the motor mount chamber; an elongated shaft connected at a first end to the impeller and at a second end to motor, wherein the second end is located within the motor mount chamber; and a first heat exchanger comprising: a first inlet; a first outlet; anda first heat exchange surface within the motor mount chamber configured to actively cool the motor mount chamber when coolant is provided to the first inlet.

10. The molten metal pump of claim 9, wherein the heat exchanger comprises a radiator.11 . The molten metal pump of claim 9, further comprising: a temperature sensor configured to measure a temperature within the motor mount chamber.

12. The molten metal pump of claim 11 , further comprising: a controller configured to adjust a flow rate of coolant fluid through the first heat exchanger based on the temperature.

13. The molten metal pump of claim 11 , wherein the temperature sensor is a thermocouple.

14. The molten metal pump of claim 9, further comprising: a second heat exchanger comprising: a second inlet; a second outlet; and a second heat exchange surface within the motor mount chamber configured to actively cool the motor mount chamber when coolant is provided to the second inlet.

15. The molten metal pump of claim 9, wherein the first heat exchange surface and the second heat exchange surface are secured to a bottom of the motor mount chamber.

16. The molten metal pump of claim 9, wherein the motor mount chamber comprises an access cover defining a sidewall thereof.

17. The molten metal pump of claim 9, wherein the motor mount chamber comprises a top plate comprising a motor opening for receiving a portion of the motor and a coolant opening for receiving the first heat exchanger.

18. The molten metal pump of claim 9, further comprising: insulation beneath a bottom plate of the motor mount chamber.

19. The molten metal pump of claim 9, wherein the heat exchanger comprises a component of the motor mount providing structural support of the motor.

20. A molten metal pump comprising: a base member comprising a base chamber having a molten metal inlet and a molten metal outlet; an impeller housed within the base chamber such that rotation of the impeller draws molten metal into the molten metal inlet and forces molten metal through the molten metal outlet; a motor mount chamber comprising a lower inlet; a motor mounted on the motor mount chamber; an elongated shaft connected at a first end to the impeller and at a second end to motor, wherein the elongated shaft extends through the lower inlet of the motor mount chamber and the second end is located within the motor mount chamber; a tube extending from outside the motor mount chamber to within the motor mount chamber to provide back pressure to a seal between the lower inlet and a portion of the elongated shaft extending therethrough; and a heat exchanger comprising: an inlet; an outlet; anda heat exchange surface within the motor mount chamber configured to actively cool the motor mount chamber when coolant is provided to the inlet.21 . The molten metal pump of claim 20, further comprising: a control system comprising: a first pressure sensor configured to measure a first pressure within the motor mount chamber; a pressure relief valve for venting the motor mount chamber; and a temperature sensor configured to measure a temperature within the motor mount chamber; wherein the controller is configured to control the pressure relief valve and / or a flow rate through the gas inlet to maintain a differential between the first pressure and a second pressure in a headspace above a molten metal level and below the seal within a predetermined range; configured to adjust a flow rate of coolant fluid through the first heat exchanger based on the temperature.

22. A molten metal pump comprising: a base member comprising a base chamber having a molten metal inlet and a molten metal outlet; an impeller housed within the base chamber such that rotation of the impeller draws molten metal into the molten metal inlet and forces molten metal through the molten metal outlet; a motor mount chamber comprising a lower inlet; a motor mounted on the motor mount chamber; an elongated shaft connected at a first end to the impeller and at a second end to motor, wherein the second end is located within the motor mount chamber; and a first heat exchanger comprising: a first inlet in fluid communication with the motor mount chamber; a first outlet in fluid communication with the motor mount chamber; anda first heat exchange surface disposed remote to the motor mount chamber configured to actively cool the motor mount chamber when coolant is provided to the first inlet.

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